WIND NOISE CORRECTION LEAK DETECTOR USAGE

VEHICLES AFFECTED: 1985 'C' Style Buicks And Oldsmobiles

The following information is being provided to assist dealer personnel in the correction of windnoise comments on some 1985 'C' Buick and Oldsmobile styles.

The vehicle may have to be roadtested to locate the windnoise. Useful tools in detecting the source of a windnoise are a powder gun, ultrasonic leak detector or a stethescope.

Figure 1 shows two areas that should be checked for windnoise. The following pages contain items within those areas and the procedures to correct the windnoise.

Area 1 - Item 1

Centre Pillar to Side Roof Rail - Joint not Fully Sealed (Figure 2)

1. Remove the centre pillar trim panel.

2. Loosen the roof drip scalp moulding and retainer.

3. Remove the centre pillar applique.

4. Carefully pull back the roof drip scalp moulding and retainer to access the joint area.

5. The joint area may be resealed using 3M No. 08531 heavy drip check sealer, 3M No. 08578 Strip Caulk (or equivalent). See Figure 2, View A.

6. Reinstall all the previously removed items. Make sure that the centre pillar applique mounting holes and opera lamp hole (if so equipped) are properly sealed prior to the installation of the applique.

Area 1 - Item 2

Door Weatherstrip Installation

1. The rear upper corner of the door weatherstrip should conform to the contour of the door frame. it should not be seated forward or low (shown by the broken lines in Figure 3), as this would increase the chance for marginal weatherstrip to body contact.

Area 1 - Item 3

The rear leg of the front door frame should contact the bumper on the lock pillar or centre garnish moulding with the door in the closed position. Contact should not be so great to increase door closing efforts (see Figure 4).

Area 1 - Item 4

The door weatherstrip should be sealed to the door assembly as indicated by the arrows in Figure 5. The weatherstrip should also be sealed to an area below the lock opening using 3M No. 08011 weatherstrip adhesive (or equivalent) as shown in Figure 5, View A.

Area 1 - Item 5

Rear Door Weatherstrips - Sedan Styles

Make sure that the weatherstrip on the rear door is properly installed and cemented to the door. Check the weatherstrip contact to the body surfaces to insure a good seal.

Area 2 - Item 1

The door frame to the inner panel reinforcement areas (with mirror and 'patch' removed) should be sealed with 3M No. 08578 Strip Caulk (or equivalent) as the shaded areas indicate in Figure 6, View A.

Area 2 - Item 2

Air Leaks at the Front Inboard Leg of the Run Channel to the Glass

This item can be revised by installing a length of weatherstrip shim material to the cavity as shown in Figure 7. The material to be installed, Dominion Sure Seal, part number RRR 1/4 or equivalent, should be 155mm (6 1/8 in.) in length and installed 30mm (1 3/16 in.) from the bottom edge of the run channel inboard leg. This material should be cemented into place using 3M No. 08011 Weatherstrip Adhesive or equivalent.

Area 2 - Item 3

The door upper frame to the inner panel seams should be sealed with 3M No. 08531 Heavy Drip Check Sealer (or equivalent), as indicated by the shaded area in Figure 8.

Area 2 - Item 4

Air leaks which have been determined to come from the windshield area can be resealed using part number 9636067 urethane adhesive (or equivalent). The lower corner of the windshield can be the source of noise and additional sealant should be applied in the area shown in Figure 9, View A.

Area 2 - Item 5

The door weatherstrip should be sealed to the door assembly as indicated by the arrows in Figure 10. The weatherstrip should also be sealed to an area even with the upper door hinge using 3M No. 09011 Weatherstrip Adhesive (or equivalent) as shown in Figure 10, View A.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.